From: Tejun Heo <tj@kernel.org>
To: Christoph Lameter <cl@linux.com>
Cc: akpm@linux-foundation.org, Pekka Enberg <penberg@cs.helsinki.fi>,
linux-kernel@vger.kernel.org,
Eric Dumazet <eric.dumazet@gmail.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Subject: Re: [cpuops cmpxchg double V3 0/5] this_cpu_cmpxchg_double support
Date: Mon, 28 Feb 2011 11:36:37 +0100 [thread overview]
Message-ID: <20110228103637.GA11045@htj.dyndns.org> (raw)
In-Reply-To: <20110225173850.486326452@linux.com>
On Fri, Feb 25, 2011 at 11:38:50AM -0600, Christoph Lameter wrote:
> This patch series introduces this_cpu_cmpxchg_double().
>
> x86 cpus support cmpxchg16b and cmpxchg8b instuction which are capable of
> switching two words instead of one during a cmpxchg.
> Two words allow to swap more state in an atomic instruction.
>
> this_cpu_cmpxchg_double() is used in the slub allocator to avoid
> interrupt disable/enable in both alloc and free fastpath.
> Using the new operation significantly speeds up the fastpaths.
Pekka, Christoph, I applied the third and fifth patches to the percpu
tree. Please feel free to pull from the following branch and apply
slub changes on top of it.
git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git for-2.6.39
HEAD is b9ec40af0e18fb7d02106be148036c2ea490fdf9. As git.korg seems a
bit slow to sync these days, it may be better to pull from
master.korg.
ssh://master.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git for-2.6.39
Thank you.
--
tejun
prev parent reply other threads:[~2011-02-28 10:36 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-25 17:38 Christoph Lameter
2011-02-25 17:38 ` [cpuops cmpxchg double V3 1/5] slub: min_partial needs to be in first cacheline Christoph Lameter
2011-02-25 17:38 ` [cpuops cmpxchg double V3 2/5] slub: Get rid of slab_free_hook_irq() Christoph Lameter
2011-02-25 18:23 ` Mathieu Desnoyers
2011-02-25 17:38 ` [cpuops cmpxchg double V3 3/5] Generic support for this_cpu_cmpxchg_double Christoph Lameter
2011-02-25 18:25 ` Mathieu Desnoyers
2011-02-25 20:28 ` Steven Rostedt
2011-02-25 20:44 ` Christoph Lameter
2011-02-25 20:53 ` Steven Rostedt
2011-02-25 20:58 ` Christoph Lameter
2011-02-25 21:01 ` Steven Rostedt
2011-02-28 10:22 ` [PATCH] percpu: Generic support for this_cpu_cmpxchg_double() this_cpu_cmpxchg_double Tejun Heo
2011-02-25 17:38 ` [cpuops cmpxchg double V3 4/5] Lockless (and preemptless) fastpaths for slub Christoph Lameter
2011-02-25 18:21 ` Mathieu Desnoyers
2011-02-25 20:46 ` Christoph Lameter
2011-02-25 20:56 ` Mathieu Desnoyers
2011-02-25 17:38 ` [cpuops cmpxchg double V3 5/5] x86: this_cpu_cmpxchg_double() support Christoph Lameter
2011-02-28 10:23 ` [PATCH] percpu, x86: Add arch-specific " Tejun Heo
2011-02-28 10:36 ` Tejun Heo [this message]
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